Android 使用Socket实现服务器与手机客户端的长连接一：一对一聊天

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wx58763b21ae3ed 2023-03-06 11:02:58 ©著作权

文章标签 android socket 服务器长连接 Java 文章分类 HarmonyOS 后端开发

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1、创建服务器端可以是Web或Java项目，创建类TcpServer：

/**
 * @描述 服务器端
 * @项目名称 SocketServer
 * @包名 com.java.socket.server
 * @类名 TCPServer
 * @author chenlin
 * @date 2012年6月26日 下午4:36:27
 * @version 1.0
 */@SuppressWarnings("all")
public class TCPServer {
    public static void main(String[] args) {
        int port = 10002;
        try {
            ServerSocket server = new ServerSocket(port);
            while (true) {
                // 获得客户端连接
                // 阻塞式方法
                System.out.println("准备阻塞...");
                final Socket client = server.accept();
                System.out.println("阻塞完成...");

                new Thread(new Runnable() {
                    @Override
                    public void run() {
                        try {
                            // 输入流，为了获取客户端发送的数据
                            InputStream is = client.getInputStream();

                            //得到输出流
                            OutputStream out = client.getOutputStream();

                            byte[] buffer = new byte[1024];
                            int len = -1;
                            System.out.println("准备read...");
                            while ((len = is.read(buffer)) != -1) {
                                String text = new String(buffer, 0, len);
                                System.out.println(text);

                                //回复信息
                                out.write("收到信息,over".getBytes());
                            }
                        } catch (Exception e) {
                            e.printStackTrace();
                        }
                    }
                }).start();

            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

2、创建手机端，先写个Socket管理类

/**
 * @描述 使用socket实现长连接
 * @项目名称 App_Chat
 * @包名 com.android.chat.utils
 * @类名 TcpUtil
 * @author chenlin
 * @date 2012年6月26日 下午4:06:43
 * @version 1.0
 */
public class TcpManager {
    protected static final int STATE_FROM_SERVER_OK = 0;
    private static String dsName = "192.168.31.239";
    private static int dstPort = 10002;
    private static Socket socket;

    private static TcpManager instance;

    private TcpManager() {
    };

    public static TcpManager getInstance() {
        if (instance == null) {
            synchronized (TcpManager.class) {
                if (instance == null) {
                    instance = new TcpManager();
                }
            }
        }
        return instance;
    }

    /**
     * 连接
     * 
     * @return
     */
    public boolean connect(final Handler handler) {

        if (socket == null || socket.isClosed()) {
            new Thread(new Runnable() {
                @Override
                public void run() {

                    try {
                        socket = new Socket(dsName, dstPort);
                    } catch (UnknownHostException e) {
                        e.printStackTrace();
                    } catch (IOException e) {
                        throw new RuntimeException("连接错误: " + e.getMessage());
                    }

                    try {
                        // 输入流，为了获取客户端发送的数据
                        InputStream is = socket.getInputStream();
                        byte[] buffer = new byte[1024];
                        int len = -1;
                        while ((len = is.read(buffer)) != -1) {
                            final String result = new String(buffer, 0, len);

                            Message msg = Message.obtain();
                            msg.obj = result;
                            msg.what = STATE_FROM_SERVER_OK;
                            handler.sendMessage(msg);
                        }
                    } catch (IOException e) {
                        e.printStackTrace();
                    }

                }
            }).start();
        }

        return true;
    }

    /**
     * 发送信息
     * 
     * @param content
     */
    public void sendMessage(String content) {
        OutputStream os = null;
        try {
            if (socket != null) {
                os = socket.getOutputStream();
                os.write(content.getBytes());
                os.flush();
            }
        } catch (IOException e) {
            throw new RuntimeException("发送失败:" + e.getMessage());
        } 
        //此处不能关闭
//      finally {
//          if (os != null) {
//              try {
//                  os.close();
//              } catch (IOException e) {
//                  throw new RuntimeException("未正常关闭输出流:" + e.getMessage());
//              }
//          }
//      }
    }

    /**
     * 关闭连接
     */
    public void disConnect() {
        if (socket != null && !socket.isClosed()) {
            try {
                socket.close();
            } catch (IOException e) {
                throw new RuntimeException("关闭异常:" + e.getMessage());
            }
            socket = null;
        }
    }
}

3、创建页面：

/**
 * @描述         Socket通信简易客户端
 * @项目名称      SocketClient
 * @包名         org.java.socket.client
 * @类名         ClientActivity
 * @author      chenlin
 * @date        2012年6月26日 下午4:43:06
 * @version     1.0 
 */

public class ClientActivity extends Activity {
    private EditText mEtContent;
    private TcpManager manager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        manager = TcpManager.getInstance();
        manager.connect(mHandler);
    }

    private Handler mHandler = new Handler(){
        public void handleMessage(android.os.Message msg) {
            switch (msg.what) {
            case TcpManager.STATE_FROM_SERVER_OK:
                String result = (String) msg.obj;
                ToastUtil.show(ClientActivity.this, result);
                break;

            default:
                break;
            }
        };
    };

    /**
     * 发送信息
     * @param view
     */
    public void clickMessage(View view){
        mEtContent = (EditText)findViewById(R.id.et);
        if (mEtContent.getText()!= null) {
            manager.sendMessage(mEtContent.getText().toString());
        }
    }

    @Override
    protected void onDestroy() {
        manager.disConnect();
        super.onDestroy();
    }
}